linux-kernel - Re: [PATCH V11 02/19] block: introduce multi-page bvec helpers

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Message-ID: <20181121150610.GA19111@ming.t460p>
Date:   Wed, 21 Nov 2018 23:06:11 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Theodore Ts'o <tytso@....edu>, Omar Sandoval <osandov@...com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Dave Chinner <dchinner@...hat.com>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, Shaohua Li <shli@...nel.org>,
        linux-raid@...r.kernel.org, David Sterba <dsterba@...e.com>,
        linux-btrfs@...r.kernel.org,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        linux-xfs@...r.kernel.org, Gao Xiang <gaoxiang25@...wei.com>,
        linux-ext4@...r.kernel.org, Coly Li <colyli@...e.de>,
        linux-bcache@...r.kernel.org, Boaz Harrosh <ooo@...ctrozaur.com>,
        Bob Peterson <rpeterso@...hat.com>, cluster-devel@...hat.com
Subject: Re: [PATCH V11 02/19] block: introduce multi-page bvec helpers

On Wed, Nov 21, 2018 at 02:19:28PM +0100, Christoph Hellwig wrote:
> On Wed, Nov 21, 2018 at 11:23:10AM +0800, Ming Lei wrote:
> > This patch introduces helpers of 'segment_iter_*' for multipage
> > bvec support.
> > 
> > The introduced helpers treate one bvec as real multi-page segment,
> > which may include more than one pages.
> 
> Unless I'm missing something these bvec vs segment names are exactly
> inverted vs how we use it elsewhere.
> 
> In the iterators we use segment for single-page bvec, and bvec for multi
> page ones, and here it is inverse.  Please switch it around.

bvec_iter_* is used for single-page bvec in current linus tree, and there are
lots of users now:

[linux]$ git grep -n "bvec_iter_*" ./ | wc
    191     995   13242

If we have to switch it first, it can be a big change, just wondering if Jens
is happy with that?

Thanks,
Ming